WAC 173-219-330. Performance standards

Reclaimed water performance standards. All Class A and Class B reclaimed water at a minimum must meet the technology-based performance standards listed in Table 1 and Table 2 for the class of reclaimed water generated at the facility. Compliance shall generally be measured at the end of treatment, however, the reclaimed water permit may specify alternative monitoring locations and water quality limits to ensure compliance with performance standards, and any additional use based requirements as listed in Table 3. Table 1: Minimum Biological Oxidation Performance Standards Biological Oxidation Parameter 1 Minimum Biological Oxidation Performance Standard Dissolved Oxygen Must be measurably present BOD 5 Monthly Average Weekly Average 30 mg/L 45 mg/L CBOD 5 25mg/L 40 mg/L TSS 30 mg/L 45 mg/L pH Minimum Maximum 6 s.u. 9 s.u. pH (Groundwater recharge) 6.5 s.u. 8.5 s.u. Biological Oxidation Parameter 1 Minimum Biological Oxidation Performance Standard Dissolved Oxygen Must be measurably present BOD 5 Monthly Average Weekly Average 30 mg/L 45 mg/L CBOD 5 25mg/L 40 mg/L TSS 30 mg/L 45 mg/L pH Minimum Maximum 6 s.u. 9 s.u. pH (Groundwater recharge) 6.5 s.u. 8.5 s.u. 1 The parameter must be measured at the end of the unit process or alternative monitoring location as set in a reclaimed water permit. Table 2: Class A and B Performance Standards Coagulation/Filtration Parameter 1 Class A Reclaimed Water Class B Reclaimed Water Turbidity 2 Monthly Average Sample Maximum Monthly Average Sample Maximum 2 NTU 5 NTU Not Applicable Not Applicable Membrane Filtration Class A Reclaimed Water Class B Reclaimed Water Turbidity 2 Monthly Average Sample Maximum Monthly Average Sample Maximum 0.2 NTU 0.5 NTU Not Applicable Not Applicable Disinfection Class A Reclaimed Water Class B Reclaimed Water Total Coliform 7-Day Median Sample Maximum 7-Day Median Sample Maximum 2.2 MPN/100 mL or CFU/100 mL 23 MPN/mL or CFU/mL 23 MPN/mL or CFU/mL 240 MPN/mL or CFU/mL Virus Removal See disinfection process standards in WAC 173-219-340 Not Applicable Not Applicable Denitrification 3 Class A Reclaimed Water Class B Reclaimed Water Total Nitrogen Monthly Average Weekly Average Monthly Average Weekly Average 10 mg/L 15 mg/L Not Applicable Not Applicable Coagulation/Filtration Parameter 1 Class A Reclaimed Water Class B Reclaimed Water Turbidity 2 Monthly Average Sample Maximum Monthly Average Sample Maximum 2 NTU 5 NTU Not Applicable Not Applicable Membrane Filtration Class A Reclaimed Water Class B Reclaimed Water Turbidity 2 Monthly Average Sample Maximum Monthly Average Sample Maximum 0.2 NTU 0.5 NTU Not Applicable Not Applicable Disinfection Class A Reclaimed Water Class B Reclaimed Water Total Coliform 7-Day Median Sample Maximum 7-Day Median Sample Maximum 2.2 MPN/100 mL or CFU/100 mL 23 MPN/mL or CFU/mL 23 MPN/mL or CFU/mL 240 MPN/mL or CFU/mL Virus Removal See disinfection process standards in WAC 173-219-340 Not Applicable Not Applicable Denitrification 3 Class A Reclaimed Water Class B Reclaimed Water Total Nitrogen Monthly Average Weekly Average Monthly Average Weekly Average 10 mg/L 15 mg/L Not Applicable Not Applicable 1 The parameter must be measured at the end of the unit process or alternative monitoring location as set in a reclaimed water permit. 2 Sample maximum for turbidity is the highest value for the day that lasts longer than five minutes. 3 Not applicable for beneficial uses 1-13 listed on Table 3: Use-Based Requirements.